Bidirectional safety knife



FIG. 1 is a perspective upper right side view;

FIG. 2 is a back view;

FIG. 3 is a right side view;

FIG. 4 is a front view;

FIG. 5 is a top view; and,

FIG. 6 is a bottom view.

The broken lines in FIGS. 2 and 4 illustrate portions of the knife that form no part of the claimed design. 

The ornamental design for a bidirectional safety knife, as shown and described. 